|Finally tired of the "System.Xml.XmlValidatingReader is obsolete" message, I undertook to replace it with the recommended XmlReader. The obsolescence documentation from MS wasn't much help, but I did manage to create code that compiled, as follows:
string nameSpace = GetSchemaNamespace(_XmlDocumentStream);
XmlTextReader schemaReader = new XmlTextReader(_SchemaStream);
XmlSchemaSet xsc = new XmlSchemaSet();
XmlNameTable nt = new NameTable();
XmlNamespaceManager nsmgr = new XmlNamespaceManager(nt);
XmlParserContext parserContext = new XmlParserContext(nt, nsmgr, null, XmlSpace.None);
XmlReaderSettings settings = new XmlReaderSettings();
settings.ValidationType = ValidationType.Schema;
settings.ValidationFlags |= XmlSchemaValidationFlags.ReportValidationWarnings;
settings.ValidationEventHandler += new ValidationEventHandler(ValidationEventHandler);
XmlReader reader = XmlReader.Create(_XmlDocumentStream, settings, parserContext);
And then I found these two things I don't understand:
1. First, the Create failed because this attribute in the xsd wasn't defined.
There was no complaint over this from the obsolete class. From the error message, I assume that this line previously covered that definition:
<xs:import namespace="http://www.w3.org/XML/1998/namespace" schemaLocation="xml.xsd"/>
What changed such that this is now a fatal error?
2. I removed the references to the above attribute so I could get a reader created and ran our set of unit tests for this process. The next surprise was that the reader doesn't handle validation errors the same as before. (a) Undefined attributes used to be Warnings. Now they are Errors. So what is now considered a warning? (b) It used to continue on from errors, allowing us to compile a list of errors and warnings for the XML being validated. Now, it bails out after the first error and I never get more than one invocation of the ValidationEventHandler. The test case that used to yield 43 errors and 21 warnings now produces a single error (and the test therefore fails). Is there a way to get the former behavior back?
modified 6-Nov-14 13:12pm.